A185516 Number of (n+1)X5 0..2 arrays with every 2X2 subblock singular.

2553, 115979, 2490449, 80761059, 2183297449, 65652458491, 1894624012417, 56140705014995, 1649002255383641, 48754926946880491, 1438991178016735921, 42542454880958044611, 1257346657004360967433, 37177308864717054716635

Offset: 1

Author

R. H. Hardin Jan 29 2011

Keywords

• nonn

Comments

Column 4 of A185521

Examples

			Some solutions for 3X5
..2..1..2..1..0....0..0..0..2..1....1..0..2..2..2....0..2..1..1..1
..0..0..0..0..0....1..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..1..0..1..1....0..0..0..1..0....0..0..2..1..2....2..2..1..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=61*a(n-1)-1038*a(n-2)-2374*a(n-3)+235515*a(n-4)-2269967*a(n-5)+4091988*a(n-6)[phone]*a(n-7)-371380096*a(n-8)[phone]*a(n-9)[phone]*a(n-10)-4856175360*a(n-11)[phone]*a(n-12)[phone]*a(n-13)-2361655296*a(n-14)